A dramatic whitewater rescue, as a group going down some rapids. One is thrown from the raft. There was someone there who knew exactly what to do. Abc's john muller has the story. Reporter: Call it an adventurous excursion gone overboard. You're looking at the moment a whitewater rafting trip turned into a white-knuckled rescue attempt. It happened on washington's white salmon river. Watch as the raft hits the 14-foot drop. Two of the rafters go flying. One man, able to cling to the edge of the raft for dear life. The other hits the water hard. Apparently knocked unconscious. He begins to float downriver. That's when experienced river guide russ cole jumps into action. The water raging around them, cole manages to pull the man to a rocky embankment. For a while, cole said it wasn't looking good. He wasn't turning over. He had his bell rung seriously. Reporter: After a few moments on the river bank, the man comes to, dazed and confused. The first thing he said to cole? I said, you went over a waterfall. He said, I had fun. At the end of the day, he said he was coming back. Reporter: Why did the man go overboard to begin with? Cole says it appears he forgot an important rafting rule, to hold on. For "good morning america," john muller, abc news, new york.

This transcript has been automatically generated and may not be 100% accurate.

White Water Rafter Rescued in White Salmon River

Russ Cole jumps into the Washington river to rescue a man who went overboard and became unconscious.

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